The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. Embodiments herein provide a system for establishing a first-to-answer call in a Mission Critical Push to Talk (MCPTT) communication. The system includes a MCPTT originating client configured to initiate a first-to-answer call and transmit a first-to-answer call request to a MCPTT server. The system includes the MCPTT server configured to receive the first-to-answer call request from the MCPTT client.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides methods and systems for managing emergency indications and emergency state of MCPTT clients.

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The disclosure provides methods and systems for managing emergency indications and emergency state of MCPTT clients.

A radio apparatus includes a session control unit configured to maintain a half-duplex session with a radio apparatus at the other end during a session keeping time, a voice recognition unit configured to recognize a predetermined voice in the session, and an extension unit configured to extend the session keeping time when the predetermined voice is recognized.

A radio apparatus includes a session control unit configured to maintain a half-duplex session with a radio apparatus at the other end during a session keeping time, a voice recognition unit configured to recognize a predetermined voice in the session, and an extension unit configured to extend the session keeping time when the predetermined voice is recognized.

An electronic device and a controlling method of the electronic device are provided. The method includes receiving a call request of a caller from a server, identifying whether a recipient who is a user of the electronic device is in a call with another caller, identifying a first external device close to the electronic device among one or more external devices connected to the electronic device in case that it is identified that the recipient is in the call with the other caller, and transmitting identification information for the identified first external device and a response to the call request to the server to transmit the call request to the identified first external device.

A device for participating in a group of cooperating devices that is identified by a group code includes membership circuitry and group circuitry. The membership circuitry is configured to generate and analyze membership messages, wherein the membership messages include a group name that is associated with the group code; and instruct the device to transmit and receive membership messages with a network. The group circuitry is configured to generate and analyze group messages, based at least on a received membership message that includes the group code; and instruct the device to transmit and receive, using a device-to-device interface circuitry of the device, group messages with a device in the group.

A device for participating in a group of cooperating devices that is identified by a group code includes membership circuitry and group circuitry. The membership circuitry is configured to generate and analyze membership messages, wherein the membership messages include a group name that is associated with the group code; and instruct the device to transmit and receive membership messages with a network. The group circuitry is configured to generate and analyze group messages, based at least on a received membership message that includes the group code; and instruct the device to transmit and receive, using a device-to-device interface circuitry of the device, group messages with a device in the group.

A device, method and system for scanning communication systems of different types is provided. A mobile device comprises: first and second transceivers to communicate first and second communication systems of different types; a memory storing first and second scan lists for scanning first and second channels on the first and second communication systems; and a controller configured to: communicate, using the first transceiver, an indication of the first and second scan lists to a gateway device configured as a proxy for the mobile device to communicate with the first communication systems; receive, using the first transceiver, from the gateway device, a reply indicating that the gateway device is capable of scanning the first communication systems using the first scan list, but is not capable of scanning the second communication systems; and control the second transceiver to scan the one or more second communication systems using the second scan list.

A device, method and system for scanning communication systems of different types is provided. A mobile device comprises: first and second transceivers to communicate first and second communication systems of different types; a memory storing first and second scan lists for scanning first and second channels on the first and second communication systems; and a controller configured to: communicate, using the first transceiver, an indication of the first and second scan lists to a gateway device configured as a proxy for the mobile device to communicate with the first communication systems; receive, using the first transceiver, from the gateway device, a reply indicating that the gateway device is capable of scanning the first communication systems using the first scan list, but is not capable of scanning the second communication systems; and control the second transceiver to scan the one or more second communication systems using the second scan list.